oSIST prEN IEC 61558-2-12:2023
(Main)Safety of transformers, reactors, power supply units and combination thereof - Part 2-12: Particular requirements and tests for constant voltage transformers and power supply units for constant voltage
Safety of transformers, reactors, power supply units and combination thereof - Part 2-12: Particular requirements and tests for constant voltage transformers and power supply units for constant voltage
Sicherheit von Transformatoren, Drosseln, Netzgeräten und entsprechenden Kombinationen - Teil 2-12: Besondere Anforderungen und Prüfungen für magnetische Spannungskonstanthalter und Netzgeräte, die Spannungskonstanthalter enthalten
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 2-12: Exigences particulières et essais pour les transformateurs à tension constante et les blocs d'alimentation pour tension constante
Varnost transformatorjev, dušilk, napajalnikov in kombinacij teh elementov - 2-12. del: Posebne zahteve in preskusi za transformatorje s konstantno napetostjo in napajalnike s konstantno napetostjo
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 61558-2-12:2023
01-januar-2023
Varnost transformatorjev, dušilk, napajalnikov in kombinacij teh elementov - 2-12.
del: Posebne zahteve in preskusi za transformatorje s konstantno napetostjo in
napajalnike s konstantno napetostjo
Safety of transformers, reactors, power supply units and combination thereof - Part 2-12:
Particular requirements and tests for constant voltage transformers and power supply
units for constant voltage
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des
combinaisons de ces éléments - Partie 2-12: Exigences particulières et essais pour les
transformateurs à tension constante et les blocs d'alimentation pour tension constante
Ta slovenski standard je istoveten z: prEN IEC 61558-2-12:2022
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
oSIST prEN IEC 61558-2-12:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 61558-2-12:2023
96/559/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61558-2-12 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-11-25 2023-02-17
SUPERSEDES DOCUMENTS:
96/546/RR
IEC TC 96 : TRANSFORMERS, REACTORS, POWER SUPPLY UNITS, AND COMBINATIONS THEREOF
SECRETARIAT: SECRETARY:
Germany Mr Wolfgang Reichelt
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
SC 3C,TC 14,TC 22,SC 22E,SC 34C,TC 51,TC
55,TC 61,SC 62A,TC 64,TC 66,TC 77,TC 85,TC
Other TC/SCs are requested to indicate their interest, if
97,TC 106,TC 108,TC 109,TC 111,TC 112
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
TITLE:
Safety of transformers, reactors, power supply units and combination thereof - Part 2-12:
Particular requirements and tests for constant voltage transformers and power supply units for
constant voltage
PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:
Copyright © 2022 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it, for
any other purpose without permission in writing from IEC.
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IEC CDV 61558-2-12 © IEC 2022 2 96/559/CDV
1 CONTENTS
2 FOREWORD. 3
3 INTRODUCTION . 5
4 1 Scope . 6
5 2 Normative references . 8
6 3 Terms and definitions . 8
7 4 General requirements . 9
8 5 General notes on tests . 9
9 6 Ratings . 9
10 7 Classification . 10
11 8 Marking and other information . 10
12 9 Protection against electric shock . 12
13 10 Change of input voltage setting . 12
14 11 Output voltage and output current under load . 12
15 12 No-load output voltage . 13
16 13 Short-circuit voltage . 14
17 14 Heating . 14
18 15 Short-circuit and overload protection . 14
19 16 Mechanical strength . 15
20 17 Protection against harmful ingress of dust, solid objects and moisture . 15
21 18 Insulation resistance, dielectric strength and leakage current . 16
22 19 Construction . 16
23 20 Components . 17
24 21 Internal wiring . 17
25 22 Supply connection and other external flexible cable or cords . 17
26 23 Terminals for external conductors . 17
27 24 Provisions for protective earthing . 17
28 25 Screws and connections . 17
29 26 Creepage distances, clearances and distances through insulation . 17
30 27 Resistance to heat, fire and tracking . 18
31 28 Resistance to rusting . 18
32 Annexes . 19
33 Bibliography . 20
34
35 Table 101 – Symbols indicating the kind of transformer . 11
36
37
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38 INTERNATIONAL ELECTROTECHNICAL COMMISSION
39 ____________
40
41 SAFETY OF TRANSFORMERS, REACTORS,
42 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
43
44 Part 2-12: Particular requirements and tests for constant voltage
45 transformers and power supply units for constant voltage
46
47
48 FOREWORD
49 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
50 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
51 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
52 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
53 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
54 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
55 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
56 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
57 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
58 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
59 consensus of opinion on the relevant subjects since each technical committee has representation from all
60 interested IEC National Committees.
61 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
62 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
63 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
64 misinterpretation by any end user.
65 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
66 transparently to the maximum extent possible in their national and regional publications. Any divergence between
67 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
68 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
69 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
70 services carried out by independent certification bodies.
71 6) All users should ensure that they have the latest edition of this publication.
72 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
73 members of its technical committees and IEC National Committees for any personal injury, property damage or
74 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
75 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
76 Publications.
77 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
78 indispensable for the correct application of this publication.
79 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
80 rights. IEC shall not be held responsible for identifying any or all such patent rights.
81 International standard IEC 61558-2-12 has been prepared by IEC technical committee 96:
82 Transformers, reactors, power supply units and combinations thereof.
83 This third edition cancels and replaces the second edition published in 2011. This edition
84 constitutes a technical revision.
85 This edition includes the following significant technical changes with respect to the previous
86 edition:
87 a) Adjustment of structure and references in accordance with IEC 61558-1:2017;
88 b) Description of constructions moved to IEC 61558-1:2017
89 c) New symbol for power supply unit with linearly regulated output voltage.
90
91
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92 The text of this International Standard is based on the following documents:
Draft Report on voting
96/XXX/FDIS 96/XXX/RVD
93 Full information on the voting for its approval can be found in the report on voting indicated in
94 the above table.
95 The language used for the development of this International Standard is English.
96 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
97 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
98 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
99 described in greater detail at www.iec.ch/standardsdev/publications.
100 It has the status of a group safety publication in accordance with IEC Guide 104.
101 This International Standard is to be used in conjunction with IEC 61558-1:2017.
102 This document supplements or modifies the corresponding clauses in IEC 61558-1:2017, so as
103 to convert that publication into the IEC standard: Particular requirements and tests for constant
104 voltage transformers and power supply units for constant voltage.
105 A list of all parts in the IEC 61558 series published under the general title Safety of
106 transformers, reactors, power supply units and combinations thereof, can be found on the
107 IEC website.
108 Future standards in this series will carry the new general title as cited above. Titles of existing
109 standards in this series will be updated at the time of the next edition.
110 Where this document states "addition", "modification" or "replacement", the relevant text of
111 IEC 61558-1:2017 is to be adopted accordingly.
112 In this document, the following print types are used:
113 − requirements proper: in roman type;
114 − test specifications: in italic type;
115 − explanatory matter: in smaller roman type:
116 In the text of this document, the words in bold are defined in Clause 3.
117 Subclauses, notes, figures and tables additional to those in IEC 61558-1:2017 are numbered
118 starting from 101; supplementary annexes are entitled AA, BB, etc.
119 The committee has decided that the contents of this document will remain unchanged until the
120 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
121 the specific document. At this date, the document will be
122 • reconfirmed,
123 • withdrawn,
124 • replaced by a revised edition, or
125 • amended.
126
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127 INTRODUCTION
128 IEC TC 96 has a group safety function in accordance with IEC Guide 104 for transformers other
129 than those intended to supply distribution networks, in particular transformers and power supply
130 units intended to allow the application of protective measures against electric shock as defined
131 by TC 64, but in certain cases including the limitation of voltage and horizontal safety function
132 for SELV, in accordance with IEC 60364-4-41.
133 The group safety function (GSF) is used because of responsibility for safety extra-low voltage
134 (SELV) in accordance with IEC 61140:2016, 5.2.6 and IEC 60364-4-41:2005, 414.3.1 or control
135 circuits in accordance with IEC 60204-1:2016, 7.2.4.
136 The group safety function is used for each part of IEC 61558-2 because different standards of
137 the IEC 61558 series can be combined in one construction but in certain cases with no limitation
138 of rated output power.
139 For example an auto-transformer in accordance with IEC 61558-2-13 can be designed with a
140 separate SELV-circuit in accordance with the particular requirements for IEC 61558-2-6 relating
141 to the general requirements of IEC 61558-1.
142
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143 SAFETY OF TRANSFORMERS, REACTORS,
144 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
145
146 Part 2-12: Particular requirements and tests for constant voltage
147 transformers and power supply units for constant voltage
148
149
150 1 Scope
151 Replacement
152 This part of IEC 61558 deals with the safety of constant voltage transformers for general
153 applications and power supply units for constant voltage for general applications. Constant
154 voltage transformers incorporating electronic circuits are also covered by this document.
155 NOTE 1 Safety includes electrical, thermal and mechanical aspects.
156 Unless otherwise specified, from here onward, the term transformer covers constant voltage
157 transformers for general applications and power supply units for constant voltage for
158 general applications.
159 This document is applicable to stationary or portable single-phase or polyphase, air-cooled
160 (natural or forced) independent or associated dry-type:
161 − constant voltage auto-transformers;
162 − constant voltage separating transformers;
163 − constant voltage isolating transformers;
164 − constant voltage safety isolating transformers.
165 The windings can be encapsulated or non-encapsulated.
166 For power supply units (linear) this document is applicable. For switch mode power supply
167 units IEC 61558-2-16 is applicable together with this document. Where two requirements are
168 in conflict, the most severe take precedence.
169 The rated supply voltage does not exceed 1 000 V AC. The rated supply frequency does not
170 exceed 500 Hz, the internal operating resonant frequency does not exceed 30 kHz and the
171 internal operating frequency does not exceed 100 MHz.
172 The rated output does not exceed:
173 − 40 kVA for single-phase constant voltage auto-transformers;
174 − 200 kVA for polyphase constant voltage auto-transformers;
175 − 25 kVA for single-phase constant voltage separating transformers and constant
176 voltage isolating transformers;
177 − 40 kVA for polyphase constant voltage separating transformers and constant
178 voltage isolating transformers;
179 − 10 kVA for single-phase constant voltage safety isolating transformers;
180 − 16 kVA for polyphase constant voltage safety isolating transformers.
181 This document is applicable to transformers without limitation of the rated output, subject to
182 an agreement between the purchaser and the manufacturer.
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183 NOTE 2 Transformers intended to supply distribution networks are not included in the scope.
184 Where applicable to constant voltage auto-transformers
185 − the no-load output voltage or the rated output voltage does not exceed 1 000 V AC
186 or 1 415 V ripple-free DC, and for independent constant voltage auto-transformers
187 the no-load output voltage and the rated output voltage exceed 50 V AC or 120 V
188 ripple-free DC;
189 − constant voltage auto-transformers covered by this document are used only in
190 applications where no insulation between circuits is required by the installation rules
191 or by the end product standard.
192 Where applicable to constant voltage separating transformers
193 − the no-load output voltage or the rated output voltage does not exceed 1 000 V AC
194 or 1 415 V ripple-free DC, and for independent constant voltage separating
195 transformers the no-load output voltage and the rated output voltage exceeds 50 V
196 AC or 120 V ripple-free DC;
197 − constant voltage separating transformers covered by this document are used only in
198 applications where double or reinforced insulation between circuits is not required by
199 the installation rules or by the end product standard.
200 Where applicable to constant voltage isolating transformers
201 − the no-load output voltage or the rated output voltage does exceed 50 V AC or 120 V
202 ripple-free DC and where applicable, does not exceed 500 V AC or 708 V ripple-free
203 DC. The no-load output voltage and the rated output voltage can be up to 1 000 V
204 AC or 1 415 V ripple-free DC for special applications.
205 − constant voltage isolating transformers covered by this document are used only in
206 applications where double or reinforced insulation between circuits is required by the
207 installation rules or by the end product standard.
208 Where applicable to constant voltage safety isolating transformers
209 − the no-load output voltage or the rated output voltage does not exceed 50 V AC or
210 120 V ripple-free DC;
211 − constant voltage safety isolating transformers covered by this document are used
212 only in applications where double or reinforced insulation between circuits is required
213 by the installation rules or by the end product standard.
214 This document is not applicable to external circuits and their components intended to be
215 connected to the input terminals and output terminals of the transformers.
216 Attention is drawn to the following if necessary:
217 − for transformers intended to be used in vehicles, on board ships, and aircraft, additional
218 requirements (from other applicable standards, national rul
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